Demountable attachment structure



1952 J. G. KRONOUER ETAL 2,616,135

DEMOUNTABLE ATTACHMENT STRUCTURE Filed Feb. 6, 1947 ill ya v fi 5ZUUJUIH. al .IHIH ll" INVENTOR J-G. KRONOUER J.C.A. RECOURT HGENTPatented Nov. 4, 1952 DEMOUNTABLE ATTACHMENT STRUCTURE Johan GeorgeKronouer and Johannes Christoffel Antonie Recourt, Eindhoven,Netherlands, assignors to Hartford National Bank and Trust Company,Hartford, Conn., as trustee Application February 6, 1947, Serial No.726,758 In the Netherlands March 1, 1944 Section 1, Public Law 690,August 8, 1946 Patent expires March 1, 1964 2 Claims.

In the case of many plate-like objects the problem is to be faced how toprovide an attachment on a surface of such a plate which may besubjected to the stress of a force parallel to the surface. The mostsimple solution of providing such an attachment piece would be to drillan aperture in the material and to introduce a screw or a rivet intothis aperture, with which the piece could be secured. Such anattachment, however, is often disfiguring, if a comparatively thin wallthat must keep up a smooth surface on the side remote from the member isconcerned. In addition the surface may be provided with an extension,for example in the form of a knob integral with the plate. If the latteris made from moulded material, for example synthetic resin, theformation of this extension entails many dfilculties when it is acrossthe direction of moulding. With objects of this kind, particularly withcabinets for wire less sets, it is therefore customary to provide thewall of the cabinet on the inside with a rib having drilled in it anaperture in which a screw can be inserted. The rib lies in the directionof moulding.

A disadvantage accruing to this method is that the rib must becomparatively thick. The difference in wall thickness resultingtherefrom leads to strains in the material. Also, since the rib, owingto the fact that the cabinet is moulded, must extend as far as the frontwall of the cabinet, a fairly high amount of material is lost in thisconstruction. Also, the tapping of thread in the rib is fairly involved;it leads to breakage of the material.

The invention relates to a construction in which these advantages do notoccur.

According to the invention, which concerns a plate made of mouldingmaterial and provided with an attachment member which may be subjectedto tensile stress by a force parallel to the plate, the member engages atransverse slot provided in the top surface of a rib which is moulded soas to be integral with the surface.

When moulding this plate, which may form part of a larger object, forexample of the cabinet of a Wireless set, care will naturally be takenthat the rib lies in the direction of moulding.

This rib may be very light, so that it requires plate by making itengage recesses provided in the sides of the rib. It may be formed inthe" shape of a strip bent-out at right angles, one

will now be set out more fully with reference tothe accompanyingdrawing, in which:

Figure 1 is a perspective view of the inside part of a wireless cabinetshowing an example of a well known attachment.

Figure 2 represents by way of example, one embodiment of the invention.

Figure 3 is an enlarged perspective view of the rib of Figure 2 andFigure 4 is an enlarged plan view of the attachment member of Figure 2.

As shown in Figure 1, the known attachment usually comprises a rib 2formed on the bottom side I of a cabinet which rib is made integraltherewith. An aperture 3 is drilled in this rib and provided with ascrew thread. By means of a screw inserted in this aperture it is, forexample, possible to secure a rear panel to the cabinet.

The wall I of the cabinet shown in Fig. 2 is provided with a rib 2having a rectangular crosssection. The surface of this cross-sectionneed be but small. The top surface of this rib is provided with atransverse slot 4 which is engaged by the attachment member 5. Thisattachment member is formed in the shape of a resilient plate bent-outat right angles. One of its sides is secured to the rib, due to the factthat it has the shape of a keyhole 6, so that an edge I is formed whichis caused to lie in the transverse slot 4. In addition, the window 6exhibits two lateral edges having lips 8 which are capable of engagingrecesses 9 provided in the sides of the rib. In order to secure thisplate to the rib, the transverse strip 1 is slid over the surface ofthis rib and the attachment member is slightly bent through so that theparts 8 may slide into the recesses 9. If the member is thus slid overthe rib, the transverse strip 1 will drop into the transverse slot 4 ata given moment and engage it resiliently. The other side of theattachment member may be provided with a screw aperture l0.

3 What we claim is: '1. In combination with a removable attachmentmember, a molded article comprising a molded p1ate,-a rib, memberintegrally molded with saidplate, said rib member having an end providedwith longitudinal undercut grooves,

said rib member also having remote from said end a groove extendingtransverse'to the longitudinal axis of said rib, said removableattachment member engaging said rib member said attachment memberhavinglaresilientpart ex tending substantially parallel to said plate,said resilient part having a key-hole-shaped opening through which aportion of said rib memben-ex-g. tends, said resilient part also having,longi-f tudinallv extending lips defining the, narrower. end of saidkey-hole-shaped opening and an ,end.

portion extending transversely to the longitudinal axis of saidresilient part, said end portion defining the end of saidkey-hole-shaped opening opposite to said--narrower ;end, saidlipsextendin l'in i said longitudinalgrooves 1 and? said end :portion'extending in -said transverse groove,

said attachment member having a second part integral with said resilientpart but at an angle thereto and said'second part'having means gforreceiving;an-;attachment.,

2. In a;molded article having a first molded plate, a second moldedplate at right angles'to and integral with said first plate, a ribmember integrallyrmolded with said plates and extending along said firstplate up to and at. right anglestosaid second plate, said rib member,having a body portion adjacent saidsecond plate andan end portion,theimprovement consisting of said body; portion havinga groove thereinextending transverse to the longitudinal axis ofsaid rib member betweensaid end portion and said second plate, said rib member havinglongitudinal grooves provided insaid end portion, a removableiattachment member engaging said rib member, said attachment membercomprising a resilient part having a key-hole-shaped opening throughwhich a portion of said rib membenextends, said resilient part alsohaving longitudinally extending lips defining the narrovver end of saidkey-hole-shaped opening and anen'dyportion extending transversely to thelongitudinal axis of said resilient part, said end portion of theresilient part defining the end of said key-holegshaped opening oppositeto said -narrower end;.:said lips extending in said longi- REFERENCESCITED' The. following references are of ,recordrin. the

file.. of this patent:

UNITED STATES PATENTS Number Name Date- 95,504 Murray Oct-5, 18691,742,141 Hicks Dec. 31, 1929 2,142,263 Regenhardt May-20, 1941-2,243,065 Barrett May;27,'1941 2,345,650 Attwood Apr.-4, 1944'-

